Berth



- G.' E. NEUBERTH.

VMACHINE FOR BENDING TUBING. :APPLICATION FILED FEB. 26, 1919.

1,320,338; I Patented Oct. 28,1919.

2 SHEETS-SHEET I.

G. E. NEUBERTH.

MACHINE FOR BENDING TUBING.

APPLICATION FILED FEB. 26, 1919..

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. GEORGE -E..1\TEUBERTH, or NEWARK, NEW JERSEY.

V MACHINE FOR isn vnnve TUBING.

Application filed February 26, 1919. Serial No. 279,229.

Tapered tubes have required anexpensive and slow procedure when'beingbent, and it has therefore been customary to make bent tapered tubes oftwo pieces and then plete tube. 7 V

This invention is adapted to so manipulate a straight tube that'the tube1s bent,

and when the bending is finished the tube is smooth on the inside andthe exterior is also smoothl Such bent tapered tubes as are employed forthe sound boxes of talking machines are good examples of the articlesmade by this machine, and for the purpose of this specification I willdescribe the machine as one adapted to make such bent tubes, althoughother forms .and kinds of tubes can be bent in this machine, and suchalterations andchanging as would adapt the machine to such modificationsare well within the scope ofthe invention.

The invention is illustrated in the accompanying drawings, in whichFigure 1 s a front View of the machine, and Fig. 2 1s aside view. Fig 3is a front view of a mandrel or burnishing tool used in the machine.Fig. 4 is a top view, broken away at places to fully illustrate theposition of the parts when thebending operation begins, and Fig. 5 is asimilar view show ng the position of the parts when the bendlng has beencompleted. Fig. 6 is a s1de viewof the machine with ,the parts in thepositlon shown in Fig. 5.1 Fig. 71s adetail perspec; tive view of thefront end of the mandrel, and Fig. 8 is a detail view showinga I11OCl1--fied form of burnishing tool.

" The machine can be mountedon any suit-- able supporter standard 10 andjis best placed about waist high to the operator; On the support reststhe base 11 of themachine, which. has a boss 12 on one side and. a block13 on the ,otherside. A die consisting of two members. is mountedonthebase 10, onemember 14 swingmg on a Specification of Letters Patent.

atented Oct. 28, 1919.

spindle 15 in the boss 12, and a sliding 'mem: ber 16 resting againstthe block 13. The swinging die member 14 and the sliding die member 16are preferablyworked in unison, andtoprovide for this the swingingmember 14 is secured by screws 17 to the pinion 18, which pinion is inmesh with the rack 19 towhich the sliding die member 16 is fastened bythe screws 20. The member 14 is provided with a cap piece 21 whichvswings with it, this being provided for by a key 7 22, and a dependingflange23 has'a handle 23'asecured thereto, byfme'ansof which an operatorcan move the dies to any desired posltlon. i

The dies arerecessed to receive a tube. In the form shown they arerecessed to recei've a tapered tube 24, which has an off-set portion 25on its large end. .The swinging die has a filler block 26 which fitsagainst the flange 23 of thecap piece 21 and i is recessed to receivethe large end of the taperedtube, this filler blockbeing alined with thesliding die when the dies are in what might be termed their closedpositions, and is adapt'edto be'removed to permit the removal of thetube after it is bent. A suitable cap 27 is fastened by suitable means,such as screws 28, to the block 13, and the movable dieJlG is thus heldin position when it slides, and thus relieving the rack 19 of strain andconsequent binding in its sliding movement. I

On the rear end of the base 11 is secured a bracket 29 which supports abearing 30 in which a sleeve 31is rotatably mounted, the

sleeve being adapted to be rotated by suit-.

able means such as a pulley 32, which is driven by belting. A shaft '33is arranged inside the sleeve. 31 and is rotatable there with, being.provided with a key or feather 34 which insures the simultaneousrotation of the sleeve and the shaft. ,The forward end of the shaft '33forms a mandrel and isillustrated in detail in Figs. 2, 3 and 7,.

theforward endv being channeled, as at 35, leaving a central web 36which is calculated to strengthen the mandrel, and the forward.

ends ofthe channels are cutaway to form inclined or beveled faces 37.'The sleeve 31 has a flange 38 ,and cheek pieces 39 are also provided.These cheek pieces have levers 1O, these-being preferably secured to.the cheek pieces by meansof the pivotal pins 41 and being held in normalposition by light springs 42 received in recesses in the ends surfacebeing adapted to do the preliminary burnishing or spinning, as will behereinafter described. The rearend of the shaft 83 is screw-threaded, asat 52, having suitable nuts 53 and preferably a thrust bearing'54c whichbears against one end 55 of a lever 56, which is attached at 57 to anarm 58 and is pivoted, at its extremity 59, to a bar 60 which isconnected to a bar 61 by a turnbuckle 62, the bar 61 being pivotallyconnected as at 63, to a. short arm 64 swinging on a pivot 65, to whichpivot is attached a finger 66, this being preferably fastened to thepivot 65 by means of a square post and recess, the end 67 of the fingerengaging a stud 68 on the sliding die 16.

. The operation of the machine is as follows:

The swinging die is moved to the position shown in 1 and 1, but theturnbuckle 62 is turned so that the shaft 33 is moved forward, and thispermits the light springs 42 to push the ends of the lever 40 inward,and the lever and the burnishing tools 50 are substantially flush withthe outside end of the mandrel, and the small end of the tube 24 canpass over the mandrel and assume. the position shown in Fig. 4L 7 Theturnbuckle 62 is then turnedto pull the shaft 33 backward, and theinclined faces 37 acting on the inclined. faces 49 force the studs orends 50 of the burnishing tool to be in contact with the inner face ofthe tube to be bent, this position being clearly illustrated in Fig. 4.The machine being in operation, the pulley 32 is revolving at a rapidrate, carrying with it'the sleeve 31, the shaft 33 and the burnishingtools 50, and the operator now moves the handle 23 so as to pull thetube 24L endwise by means of the swinging die member 1a, which has thefiller block inserted in it, but the'tube hasa tendency towrinkle on thewallbeing bent around the smallest radius, and the rotating burnishingtool smooths these wrinkles out. Until such wrinkles are smoothed, theswinging die is halted in .1ts swinging movement, as any wrinkles willobstruct the forward movement of the die 16 and its stud 68 will notpermit the finger 66 to'move, and this finger 66, being connected, bymeans of the arm 64 and the bars 60 and 61, the turnbuckle 62 and thelever 56, to the shaft 33, holds the shaft so that the inclined faces &9of the levers 40 cannot push the shaft 38 forward. Such pushing forwardof thejshaft is only possible when the die16 can slide forward, and thedie can only go forward when the wrinkles have been removed from themetal in the tube that is being bent. This insures a smooth product whenthe bending is complete, it burnishestheinside of the tube,it regulatesthe swinging of the handle23 and provides a good operation that insuresa satisfactory result.

As the handle 23 is swung, the swinging die member rotates'through apartial rotation and the die member 16 moves tangen tially thereto, andwhen the bending has been completed the filler block and vthe tube arequickly loosened, the filler block is taken out and the bent tube can beremoved through the back end of the swinging die member, the swingingdie member is again returned to the position shown in Fig. 1,

the filler block again inserted and the" ma-. V

pansible and contractible mandrel, and

means for yieldingly holding the mandrel against the tube.

2. A machine for bending tubes comprising dies to receive a tube andadapted to move the tube in an are, an eXpansible mandrel in the tube,means for yieldingly holding the mandrel against the tube, the dies andthe mandrel beingrotative relative to one another. 7 V i 3. A machinefor bending'tapered tubing comprising a die to pull the tube endwiseinto a bent form, and a revolving burnishing tool bearingon the insideof the tube at the place of bending. I T

l. A machine for bending tapered tubing comprising a die adapted toswing and thus pull a tube endwise into a bent form, a rotatingcontractible burnishing tool in said tube and arranged so that itoperates against the inside of the the tube at the point where thebendmg takes place, and means for actuat 5. A. machine a. bending tiltina1..

prising a die made of two members, the members belng adapted to embracea tube,

iic

A one of said members being mounted to swing against the inside of atube in said die, and

and pull the tube endwise into a bent form, a burnishing tool operatingon the inside of the tube where the bending takes place, means forreleasing and increasing the pres sure eXertedby the tool, and anoperative connection between the die and said means .whereb-y theprogress of thedie regulates the pressure.

6. A machine for bending tapered tubes comprising a die having aswinging member and a'mem-ber sliding tangentially thereto, the membersbeing recessed to receive a tapered tube, a mandrel rotating within therecess oppositethe point where the members of the die separate, aburnishing tool on the mandrel, means for moving said tool means forholding the tool against the tube as the tubeis moved with its large endfirst. 7. A machine for bending taperedtubes comprising a die formed ofa swinging member and a member sliding tangentially thereto, saidmembers being recessed to re ceive a tapered tube, a burnishing toolrotatably arranged within the tube, means for holding the tool againstthe inside of the tube, and means connecting the die with the holdingmeans to cause the tool to yield only as the die progresses.

8. A machine for bending tapered tubes comprising a die having aswinging. member with a curved recess to receive andbend a tapered tube,a sliding die with a tapered recess to receive a straight tapered tube,

7 means for causing the dies to move'in unison, a burnishing toolbearing on the inside of the tapered tube, and means controlled r by theprogress of the die-for regulating the 40 pressure of the tool againstthe tube.

9. A machine for bending tapered tubes comprising a die having aswinging member with a curved recess to receive and bend a beinginclined, and a lever in the recesswith copies of this patent may beobtained for five cents each, by addressing Washington. D. 0.

an inclined end bearing on the inclined wall, the'lever and the mandrelbeing slidable longitudinally relative to each other.

11. A machine for bending tubes comprising die to receive a tube andpull it endwise into a bent form, a mandrel having a recess therein, theend wallof the recess being inclined, a lever in the recess with aninclined end bearing on the inclined wall, the lever and the mandrelbeing slidable longitudinally relative to each other, and meansconnected to and controlled by the die for causing such relative slidingmovement.

12. A machine for bending metal tubes comprising a die having twomembers, a swinging memberand a sliding member, the sliding membermoving tangentially to the swinging member, both members being recessedto receive a tube, means for moving the swinging member so as to pullthe tube endwise into a bent form, amandrel adapted to slide and torotate within the tube, the mandrel having a recess, a lever resting inthe recess and held against sliding move ment, but adapted to rotatewith the mandrel, the lever having a burnishing part thereon, the leverand the mandrel having co-acting means for moving the end of the leverradially when the mandrel is slid horizontally, manually operated meansfor sliding the mandrel, and means connected with and controlled by thedie for permitting the sliding of the mandrel.

13. In a tube bending machine, a mandrel havinga projecting burnishingpart, means for movincr a metal element to be treated along saidburnishing part, said element being-adapted tomove the burnishing partin one direction, and means controlled by the element moving means formoving the burnishing part in the opposite direction.

14. A machine for changing the conformation of metal tubin comprising adie having a recess to recelve the tubing, said recessbeing shaped todefine the finished product, and a burnishing tool rotatably mounted insaid tube and adapted to bear on the 1nner surface of the tube, said dieand burnishing tool being movable longitudinally relative to each other.

In testimony that I claim the foregoing, I h, ve hereto set my hand,this 25th day of February, 1919.

GEORGE E. NEUBERTH.

the Commissioner of Patents,

